Understanding Priority and the Stack in Magic: The Gathering

If you’ve just started playing Magic: The Gathering, you’ve probably heard people talk about “priority” and “the stack” as if they’re secret ingredients only known to judges or pro players. In reality, these concepts are part of every single game of Magic, even if you don’t realize it. Understanding them will help you make better plays, avoid costly mistakes, and gain more control over the flow of the game.

What Is Priority?

In Magic, players don’t simply take turns casting spells whenever they feel like it. Instead, the game operates on a strict timing structure, where players take turns receiving what’s called priority. When you have priority, it means you are allowed to cast a spell, activate an ability, or do nothing and pass. You must explicitly pass priority in order for anything to actually happen in the game.

This means that even after you cast a spell, it doesn’t resolve right away. Instead, it goes on the stack and you must pass priority to give your opponent a chance to respond. If they don’t, the spell resolves. But if they do respond, their response goes on top of the stack, and the process repeats until all players pass priority in succession. Only then does the topmost spell or ability resolve.

The Stack Explained

Think of the stack as Magic’s version of a to-do list. Every time a spell is cast or an ability is activated or triggered, it is placed onto this invisible pile. The last thing that goes on the stack is the first to resolve, following what’s called a “last in, first out” rule.

Here’s a basic example: You cast Lightning Bolt targeting your opponent’s creature. That Lightning Bolt is placed on the stack. You then pass priority. Your opponent, holding Giant Growth, decides to cast it targeting the same creature to give it +3/+3. That Giant Growth goes on top of the stack. Since no one adds anything else, the Giant Growth resolves first—boosting the creature’s toughness to survive the Bolt—and then Lightning Bolt resolves, dealing damage but not killing the now-buffed creature.

In short, the stack dictates what happens and when. Timing is everything.

Triggered Abilities and Why Timing Matters

An important detail many new players overlook is that triggered abilities also go on the stack. When a creature with a “when this enters the battlefield” effect comes into play, that triggered ability doesn’t happen instantly. It’s placed on the stack like any other spell or ability, waiting to resolve.

For example, when your opponent plays Risen Reef, its ability to reveal the top card of their library is a triggered ability. That trigger goes on the stack. Even if you respond by destroying the Risen Reef with Shock, the ability is already on the stack and will resolve regardless of whether the creature is still on the battlefield. In other words, destroying the source of a triggered ability does not stop the ability itself once it’s on the stack. This is a common mistake among new players, and understanding this rule can help you avoid wasting your removal spells.